Give more time for pairing

[woody-apple]

Internal tests have shown that 15 seconds to complete all of pairing, fails a significant amount (10%+) of pairings early. mDNS timeouts, network delay, device delay.

Further break downs to come, but we've found that moving this to 45s significantly reduces the amount of outliers (almost to 0).

[github-actions]

PR #23264: Size comparison from e4f60ce to a1f4cfe

Decreases (1 build for nrfconnect)

platform	target	config	section	e4f60ce	a1f4cfe	change	% change
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	text	815888	815884	-4	-0.0

Full report (3 builds for mbed, nrfconnect)

platform	target	config	section	e4f60ce	a1f4cfe	change	% change
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2452168	2452168	0	0.0
			.bss	215028	215028	0	0.0
			.data	5872	5872	0	0.0
			.text	1414812	1414812	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1183627	1183627	0	0.0
			bss	144457	144457	0	0.0
			rodata	144396	144396	0	0.0
			text	815888	815884	-4	-0.0
	all-clusters-minimal-app	nrf52840dk_nrf52840	(read/write)	1162311	1162311	0	0.0
			bss	143684	143684	0	0.0
			rodata	135968	135968	0	0.0
			text	803780	803780	0	0.0